/* 清楚浏览器默认样式 */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-family: '微软雅黑', 'Helvetica Neue', "STXiHei", 'Source Sans Pro', Helvetica, Arial, sans-serif;
    box-sizing: border-box;
}
html,body{
    height: 100%;
}
.clearfix::after{
    content:"";
    display: block;
    clear: both;
    overflow: hidden;
}
